21999999993020 has 96 divisors (see below), whose sum is σ = 52877940756480. Its totient is φ = 7531726026240.

The previous prime is 21999999993019. The next prime is 21999999993029. The reversal of 21999999993020 is 2039999999912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21999999993029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871378037 + ... + 871403283.

It is an arithmetic number, because the mean of its divisors is an integer number (550811882880).

Almost surely, 2^{21999999993020} is an apocalyptic number.

21999999993020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21999999993020 is an abundant number, since it is smaller than the sum of its proper divisors (30877940763460).

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

21999999993020 is a wasteful number, since it uses less digits than its factorization.

21999999993020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34203 (or 34201 counting only the distinct ones).

The product of its (nonzero) digits is 516560652, while the sum is 80.

The spelling of 21999999993020 in words is "twenty-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-three thousand, twenty".