21214026661554 has 24 divisors (see below), whose sum is σ = 45964007441040. Its totient is φ = 7071298680888.

The previous prime is 21214026661549. The next prime is 21214026661559. The reversal of 21214026661554 is 45516662041212.

It is an interprime number because it is at equal distance from previous prime (21214026661549) and next prime (21214026661559).

It is not an unprimeable number, because it can be changed into a prime (21214026661559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553252 + ... + 6537135.

It is an arithmetic number, because the mean of its divisors is an integer number (1915166976710).

Almost surely, 2^{21214026661554} is an apocalyptic number.

21214026661554 is an abundant number, since it is smaller than the sum of its proper divisors (24749980779486).

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

21214026661554 is a wasteful number, since it uses less digits than its factorization.

21214026661554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7256614 (or 7256611 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21214026661554 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, six hundred sixty-one thousand, five hundred fifty-four".