21053435340 has 96 divisors (see below), whose sum is σ = 67784532480. Its totient is φ = 4782675456.

The previous prime is 21053435327. The next prime is 21053435353. The reversal of 21053435340 is 4353435012.

It is an interprime number because it is at equal distance from previous prime (21053435327) and next prime (21053435353).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21053435298 and 21053435307.

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, 85305 + ... + 222224.

It is an arithmetic number, because the mean of its divisors is an integer number (706088880).

Almost surely, 2^21053435340 is an apocalyptic number.

21053435340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21053435340 is an abundant number, since it is smaller than the sum of its proper divisors (46731097140).

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

21053435340 is a wasteful number, since it uses less digits than its factorization.

21053435340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307711 (or 307709 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 21053435340 in words is "twenty-one billion, fifty-three million, four hundred thirty-five thousand, three hundred forty".