21719626542 has 48 divisors (see below), whose sum is σ = 48208013568. Its totient is φ = 7063514640.

The previous prime is 21719626529. The next prime is 21719626553. The reversal of 21719626542 is 24562691712.

21719626542 is a `hidden beast` number, since 2 + 1 + 7 + 19 + 626 + 5 + 4 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 689713 + ... + 720515.

It is an arithmetic number, because the mean of its divisors is an integer number (1004333616).

Almost surely, 2^21719626542 is an apocalyptic number.

21719626542 is an abundant number, since it is smaller than the sum of its proper divisors (26488387026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21719626542 is a wasteful number, since it uses less digits than its factorization.

21719626542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31765 (or 31762 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 21719626542 in words is "twenty-one billion, seven hundred nineteen million, six hundred twenty-six thousand, five hundred forty-two".