21211503454 has 8 divisors (see below), whose sum is σ = 32557191480. Its totient is φ = 10359106296.

The previous prime is 21211503433. The next prime is 21211503473. The reversal of 21211503454 is 45430511212.

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

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, 123322609 + ... + 123322780.

It is an arithmetic number, because the mean of its divisors is an integer number (4069648935).

Almost surely, 2^21211503454 is an apocalyptic number.

21211503454 is a deficient number, since it is larger than the sum of its proper divisors (11345688026).

21211503454 is a wasteful number, since it uses less digits than its factorization.

21211503454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246645434.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21211503454 in words is "twenty-one billion, two hundred eleven million, five hundred three thousand, four hundred fifty-four".