21215958141 has 16 divisors (see below), whose sum is σ = 32939063424. Its totient is φ = 11894660544.

The previous prime is 21215958121. The next prime is 21215958167. The reversal of 21215958141 is 14185951212.

It is not a de Polignac number, because 21215958141 - 2⁶ = 21215958077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21215958141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215958121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9529866 + ... + 9532091.

It is an arithmetic number, because the mean of its divisors is an integer number (2058691464).

Almost surely, 2^21215958141 is an apocalyptic number.

21215958141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21215958141 is a deficient number, since it is larger than the sum of its proper divisors (11723105283).

21215958141 is a wasteful number, since it uses less digits than its factorization.

21215958141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19062020.

The product of its digits is 28800, while the sum is 39.

The spelling of 21215958141 in words is "twenty-one billion, two hundred fifteen million, nine hundred fifty-eight thousand, one hundred forty-one".