21055356954 has 12 divisors (see below), whose sum is σ = 45619940106. Its totient is φ = 7018452312.

The previous prime is 21055356929. The next prime is 21055356967. The reversal of 21055356954 is 45965355012.

21055356954 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 535 + 69 + 54 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15869196729 + 5186160225 = 125973^2 + 72015^2 .

It is a super-3 number, since 3×21055356954³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584871009 + ... + 584871044.

Almost surely, 2^21055356954 is an apocalyptic number.

21055356954 is an abundant number, since it is smaller than the sum of its proper divisors (24564583152).

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

21055356954 is a wasteful number, since it uses less digits than its factorization.

21055356954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169742061 (or 1169742058 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 21055356954 in words is "twenty-one billion, fifty-five million, three hundred fifty-six thousand, nine hundred fifty-four".