21742033406 has 16 divisors (see below), whose sum is σ = 32695506144. Its totient is φ = 10843567584.

The previous prime is 21742033349. The next prime is 21742033463. The reversal of 21742033406 is 60433024712.

It is an interprime number because it is at equal distance from previous prime (21742033349) and next prime (21742033463).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310495 + ... + 1326981.

It is an arithmetic number, because the mean of its divisors is an integer number (2043469134).

Almost surely, 2^21742033406 is an apocalyptic number.

21742033406 is a deficient number, since it is larger than the sum of its proper divisors (10953472738).

21742033406 is a wasteful number, since it uses less digits than its factorization.

21742033406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18115.

The product of its (nonzero) digits is 24192, while the sum is 32.

The spelling of 21742033406 in words is "twenty-one billion, seven hundred forty-two million, thirty-three thousand, four hundred six".