21351426705620 has 48 divisors (see below), whose sum is σ = 48961256198400. Its totient is φ = 7756682363520.

The previous prime is 21351426705599. The next prime is 21351426705659. The reversal of 21351426705620 is 2650762415312.

It is a super-2 number, since 2×21351426705620² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46475915 + ... + 46933074.

It is an arithmetic number, because the mean of its divisors is an integer number (1020026170800).

Almost surely, 2^{21351426705620} is an apocalyptic number.

21351426705620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21351426705620 is an abundant number, since it is smaller than the sum of its proper divisors (27609829492780).

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

21351426705620 is a wasteful number, since it uses less digits than its factorization.

21351426705620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93410048 (or 93410046 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21351426705620 in words is "twenty-one trillion, three hundred fifty-one billion, four hundred twenty-six million, seven hundred five thousand, six hundred twenty".