21702038740 has 12 divisors (see below), whose sum is σ = 45574281396. Its totient is φ = 8680815488.

The previous prime is 21702038713. The next prime is 21702038749. The reversal of 21702038740 is 4783020712.

It can be written as a sum of positive squares in 2 ways, for example, as 11222012356 + 10480026384 = 105934^2 + 102372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21702038696 and 21702038705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702038749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542550949 + ... + 542550988.

It is an arithmetic number, because the mean of its divisors is an integer number (3797856783).

Almost surely, 2^21702038740 is an apocalyptic number.

21702038740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21702038740 is an abundant number, since it is smaller than the sum of its proper divisors (23872242656).

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

21702038740 is a wasteful number, since it uses less digits than its factorization.

21702038740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085101946 (or 1085101944 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 21702038740 in words is "twenty-one billion, seven hundred two million, thirty-eight thousand, seven hundred forty".