21214642207 has 16 divisors (see below), whose sum is σ = 23906073600. Its totient is φ = 18651196800.

The previous prime is 21214642199. The next prime is 21214642271. The reversal of 21214642207 is 70224641212.

It is a cyclic number.

It is not a de Polignac number, because 21214642207 - 2³ = 21214642199 is a prime.

It is a super-2 number, since 2×21214642207² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214642297) 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, 498919 + ... + 539767.

It is an arithmetic number, because the mean of its divisors is an integer number (1494129600).

Almost surely, 2^21214642207 is an apocalyptic number.

21214642207 is a deficient number, since it is larger than the sum of its proper divisors (2691431393).

21214642207 is a wasteful number, since it uses less digits than its factorization.

21214642207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42414.

The product of its (nonzero) digits is 10752, while the sum is 31.

The spelling of 21214642207 in words is "twenty-one billion, two hundred fourteen million, six hundred forty-two thousand, two hundred seven".