211421023420 has 48 divisors (see below), whose sum is σ = 445153510368. Its totient is φ = 84345845760.

The previous prime is 211421023343. The next prime is 211421023459. The reversal of 211421023420 is 24320124112.

It is a junction number, because it is equal to n+sod(n) for n = 211421023391 and 211421023400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30368740 + ... + 30375700.

It is an arithmetic number, because the mean of its divisors is an integer number (9274031466).

Almost surely, 2^211421023420 is an apocalyptic number.

211421023420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211421023420 is an abundant number, since it is smaller than the sum of its proper divisors (233732486948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211421023420 is a wasteful number, since it uses less digits than its factorization.

211421023420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750 (or 10748 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 211421023420 its reverse (24320124112), we get a palindrome (235741147532).

The spelling of 211421023420 in words is "two hundred eleven billion, four hundred twenty-one million, twenty-three thousand, four hundred twenty".