21010697760 has 192 divisors, whose sum is σ = 71690427648. Its totient is φ = 5141704704.

The previous prime is 21010697759. The next prime is 21010697803. The reversal of 21010697760 is 6779601012.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1069789 + ... + 1089251.

It is an arithmetic number, because the mean of its divisors is an integer number (373387644).

Almost surely, 2^21010697760 is an apocalyptic number.

21010697760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010697760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35845213824).

21010697760 is an abundant number, since it is smaller than the sum of its proper divisors (50679729888).

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

21010697760 is a wasteful number, since it uses less digits than its factorization.

21010697760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19667 (or 19659 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The spelling of 21010697760 in words is "twenty-one billion, ten million, six hundred ninety-seven thousand, seven hundred sixty".