21980151 has 12 divisors (see below), whose sum is σ = 31847712. Its totient is φ = 14607936.

The previous prime is 21980137. The next prime is 21980171. The reversal of 21980151 is 15108912.

It is not a de Polignac number, because 21980151 - 2¹⁵ = 21947383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 591 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (2653976).

Almost surely, 2^21980151 is an apocalyptic number.

21980151 is a deficient number, since it is larger than the sum of its proper divisors (9867561).

21980151 is a wasteful number, since it uses less digits than its factorization.

21980151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590 (or 7587 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 21980151 is about 4688.2993718405. The cubic root of 21980151 is about 280.1196384994.

The spelling of 21980151 in words is "twenty-one million, nine hundred eighty thousand, one hundred fifty-one".