21255456034 has 4 divisors (see below), whose sum is σ = 31883184054. Its totient is φ = 10627728016.

The previous prime is 21255456023. The next prime is 21255456041. The reversal of 21255456034 is 43065455212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16809900409 + 4445555625 = 129653^2 + 66675^2 .

It is a super-2 number, since 2×21255456034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21255455984 and 21255456002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313864007 + ... + 5313864010.

Almost surely, 2^21255456034 is an apocalyptic number.

21255456034 is a deficient number, since it is larger than the sum of its proper divisors (10627728020).

21255456034 is a wasteful number, since it uses less digits than its factorization.

21255456034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10627728019.

The product of its (nonzero) digits is 144000, while the sum is 37.

It can be divided in two parts, 212 and 55456034, that added together give a triangular number (55456246 = T₁₀₅₃₁).

The spelling of 21255456034 in words is "twenty-one billion, two hundred fifty-five million, four hundred fifty-six thousand, thirty-four".