21220025510453 has 16 divisors (see below), whose sum is σ = 26460940322304. Its totient is φ = 16532081925360.

The previous prime is 21220025510447. The next prime is 21220025510471. The reversal of 21220025510453 is 35401552002212.

It is a cyclic number.

It is not a de Polignac number, because 21220025510453 - 2⁶ = 21220025510389 is a prime.

It is a super-2 number, since 2×21220025510453² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220025512453) 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, 24597275 + ... + 25445352.

It is an arithmetic number, because the mean of its divisors is an integer number (1653808770144).

Almost surely, 2^{21220025510453} is an apocalyptic number.

It is an amenable number.

21220025510453 is a deficient number, since it is larger than the sum of its proper divisors (5240914811851).

21220025510453 is a wasteful number, since it uses less digits than its factorization.

21220025510453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50048152.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21220025510453 its reverse (35401552002212), we get a palindrome (56621577512665).

The spelling of 21220025510453 in words is "twenty-one trillion, two hundred twenty billion, twenty-five million, five hundred ten thousand, four hundred fifty-three".