21400402442 has 16 divisors (see below), whose sum is σ = 32497077312. Its totient is φ = 10568120640.

The previous prime is 21400402399. The next prime is 21400402447. The reversal of 21400402442 is 24420400412.

It is not an unprimeable number, because it can be changed into a prime (21400402447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596267 + ... + 631137.

It is an arithmetic number, because the mean of its divisors is an integer number (2031067332).

Almost surely, 2^21400402442 is an apocalyptic number.

21400402442 is a deficient number, since it is larger than the sum of its proper divisors (11096674870).

21400402442 is a wasteful number, since it uses less digits than its factorization.

21400402442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38653.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21400402442 its reverse (24420400412), we get a palindrome (45820802854).

The spelling of 21400402442 in words is "twenty-one billion, four hundred million, four hundred two thousand, four hundred forty-two".