21402053020 has 12 divisors (see below), whose sum is σ = 44944311384. Its totient is φ = 8560821200.

The previous prime is 21402052993. The next prime is 21402053027. The reversal of 21402053020 is 2035020412.

It is a super-2 number, since 2×21402053020² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402053027) 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, 535051306 + ... + 535051345.

It is an arithmetic number, because the mean of its divisors is an integer number (3745359282).

Almost surely, 2^21402053020 is an apocalyptic number.

21402053020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21402053020 is an abundant number, since it is smaller than the sum of its proper divisors (23542258364).

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

21402053020 is a wasteful number, since it uses less digits than its factorization.

21402053020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070102660 (or 1070102658 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21402053020 its reverse (2035020412), we get a palindrome (23437073432).

The spelling of 21402053020 in words is "twenty-one billion, four hundred two million, fifty-three thousand, twenty".