21534154680 has 64 divisors (see below), whose sum is σ = 64646618400. Its totient is φ = 5738516480.

The previous prime is 21534154657. The next prime is 21534154703. The reversal of 21534154680 is 8645143512.

It is an interprime number because it is at equal distance from previous prime (21534154657) and next prime (21534154703).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117136 + ... + 238304.

Almost surely, 2^21534154680 is an apocalyptic number.

21534154680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21534154680 is an abundant number, since it is smaller than the sum of its proper divisors (43112463720).

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

21534154680 is a wasteful number, since it uses less digits than its factorization.

21534154680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122664 (or 122660 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 21534154680 in words is "twenty-one billion, five hundred thirty-four million, one hundred fifty-four thousand, six hundred eighty".