21426940906 has 32 divisors (see below), whose sum is σ = 37377889920. Its totient is φ = 9022841856.

The previous prime is 21426940901. The next prime is 21426940939. The reversal of 21426940906 is 60904962412.

It is a super-2 number, since 2×21426940906² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21426940901) 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, 132006 + ... + 245518.

It is an arithmetic number, because the mean of its divisors is an integer number (1168059060).

Almost surely, 2^21426940906 is an apocalyptic number.

21426940906 is a deficient number, since it is larger than the sum of its proper divisors (15950949014).

21426940906 is a wasteful number, since it uses less digits than its factorization.

21426940906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113758.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 21426940906 in words is "twenty-one billion, four hundred twenty-six million, nine hundred forty thousand, nine hundred six".