22021221510 has 24 divisors (see below), whose sum is σ = 57255176160. Its totient is φ = 5872325712.

The previous prime is 22021221493. The next prime is 22021221529. The reversal of 22021221510 is 1512212022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122340030 + ... + 122340209.

It is an arithmetic number, because the mean of its divisors is an integer number (2385632340).

Almost surely, 2^22021221510 is an apocalyptic number.

22021221510 is an abundant number, since it is smaller than the sum of its proper divisors (35233954650).

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

22021221510 is a wasteful number, since it uses less digits than its factorization.

22021221510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244680252 (or 244680249 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 22021221510 its reverse (1512212022), we get a palindrome (23533433532).

The spelling of 22021221510 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, five hundred ten".