21102719694 has 32 divisors (see below), whose sum is σ = 48530722560. Its totient is φ = 5992356672.

The previous prime is 21102719657. The next prime is 21102719699. The reversal of 21102719694 is 49691720112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102719699) 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, 1534399 + ... + 1548090.

It is an arithmetic number, because the mean of its divisors is an integer number (1516585080).

Almost surely, 2^21102719694 is an apocalyptic number.

21102719694 is an abundant number, since it is smaller than the sum of its proper divisors (27428002866).

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

21102719694 is a wasteful number, since it uses less digits than its factorization.

21102719694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082664.

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 21102719694 in words is "twenty-one billion, one hundred two million, seven hundred nineteen thousand, six hundred ninety-four".