21506734462054 has 8 divisors (see below), whose sum is σ = 32465580048288. Its totient is φ = 10684874445960.

The previous prime is 21506734462019. The next prime is 21506734462139. The reversal of 21506734462054 is 45026443760512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21506734461989 and 21506734462007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34246392142 + ... + 34246392769.

It is an arithmetic number, because the mean of its divisors is an integer number (4058197506036).

Almost surely, 2^{21506734462054} is an apocalyptic number.

21506734462054 is a deficient number, since it is larger than the sum of its proper divisors (10958845586234).

21506734462054 is a wasteful number, since it uses less digits than its factorization.

21506734462054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68492785070.

The product of its (nonzero) digits is 4838400, while the sum is 49.

The spelling of 21506734462054 in words is "twenty-one trillion, five hundred six billion, seven hundred thirty-four million, four hundred sixty-two thousand, fifty-four".