21400203004 has 12 divisors (see below), whose sum is σ = 37474955784. Its totient is φ = 10693072784.

The previous prime is 21400202969. The next prime is 21400203037. The reversal of 21400203004 is 40030200412.

It is a super-2 number, since 2×21400203004² (a number of 21 digits) contains 22 as substring.

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, 1750327 + ... + 1762510.

It is an arithmetic number, because the mean of its divisors is an integer number (3122912982).

Almost surely, 2^21400203004 is an apocalyptic number.

It is an amenable number.

21400203004 is a deficient number, since it is larger than the sum of its proper divisors (16074752780).

21400203004 is a wasteful number, since it uses less digits than its factorization.

21400203004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514364 (or 3514362 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21400203004 its reverse (40030200412), we get a palindrome (61430403416).

The spelling of 21400203004 in words is "twenty-one billion, four hundred million, two hundred three thousand, four".