1231022421 has 16 divisors (see below), whose sum is σ = 1886625600. Its totient is φ = 792381744.

The previous prime is 1231022413. The next prime is 1231022437. The reversal of 1231022421 is 1242201321.

It is a happy number.

It is not a de Polignac number, because 1231022421 - 2³ = 1231022413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231022394 and 1231022403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231012421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785311 + ... + 786876.

It is an arithmetic number, because the mean of its divisors is an integer number (117914100).

Almost surely, 2^1231022421 is an apocalyptic number.

It is an amenable number.

1231022421 is a deficient number, since it is larger than the sum of its proper divisors (655603179).

1231022421 is a wasteful number, since it uses less digits than its factorization.

1231022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572225 (or 1572219 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1231022421 is about 35085.9291027044. The cubic root of 1231022421 is about 1071.7380611988.

Adding to 1231022421 its reverse (1242201321), we get a palindrome (2473223742).

The spelling of 1231022421 in words is "one billion, two hundred thirty-one million, twenty-two thousand, four hundred twenty-one".