21219274371 has 16 divisors (see below), whose sum is σ = 28960436736. Its totient is φ = 13812377376.

The previous prime is 21219274367. The next prime is 21219274399. The reversal of 21219274371 is 17347291212.

It is a happy number.

It is not a de Polignac number, because 21219274371 - 2² = 21219274367 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21219274301) 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, 362761 + ... + 417173.

It is an arithmetic number, because the mean of its divisors is an integer number (1810027296).

Almost surely, 2^21219274371 is an apocalyptic number.

21219274371 is a deficient number, since it is larger than the sum of its proper divisors (7741162365).

21219274371 is a wasteful number, since it uses less digits than its factorization.

21219274371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57482.

The product of its digits is 42336, while the sum is 39.

The spelling of 21219274371 in words is "twenty-one billion, two hundred nineteen million, two hundred seventy-four thousand, three hundred seventy-one".