21354661063700 has 72 divisors (see below), whose sum is σ = 46604781144768. Its totient is φ = 8493110046720.

The previous prime is 21354661063693. The next prime is 21354661063733. The reversal of 21354661063700 is 736016645312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12978644 + ... + 14531156.

Almost surely, 2^{21354661063700} is an apocalyptic number.

21354661063700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21354661063700 is an abundant number, since it is smaller than the sum of its proper divisors (25250120081068).

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

21354661063700 is a wasteful number, since it uses less digits than its factorization.

21354661063700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553313 (or 1553306 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 21354661063700 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-one million, sixty-three thousand, seven hundred".