21400102012 has 12 divisors (see below), whose sum is σ = 37451388520. Its totient is φ = 10699705296.

The previous prime is 21400102007. The next prime is 21400102033. The reversal of 21400102012 is 21020100412.

It is a happy number.

It is a super-2 number, since 2×21400102012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21400101983 and 21400102001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95314 + ... + 227782.

Almost surely, 2^21400102012 is an apocalyptic number.

It is an amenable number.

21400102012 is a deficient number, since it is larger than the sum of its proper divisors (16051286508).

21400102012 is a wasteful number, since it uses less digits than its factorization.

21400102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172860 (or 172858 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21400102012 its reverse (21020100412), we get a palindrome (42420202424).

The spelling of 21400102012 in words is "twenty-one billion, four hundred million, one hundred two thousand, twelve".